Drill for drilling holes in rock or the like.



PATENTED MA: 22, 1906.

. J. H. THOMAS. v DRILL FOR DRILLING HOLES IN ROCK 0 THELIKE.

APPLIUA TION FILED NOV. 14, 1904.

til.

u; 434 it than) l\J it In -1; in a JO i T HENRY .CHUMAS, Oi 5Application fileil ilovember To all 10/7/0772 it mew con/(367%.:

Be it known that a subject of the I Ji'ihennesburg, in veal, haveinvented certain new and useful Improvements in Drills for DrillingHoles in. Rock or the Lilac, (For which i have insole epplicstion forpatent in the Transvaal, No. 293, filed July 20, 1904,) of which theiollow- 11g of England, residing at 'ing lS- specification.

The ire-sent invention is applicable to the drills or hits employed fordrilling holes in col; and the like in mining, quarrying, enrl similaroperations. It may be utilized in the production oi such tools eitherfor hand. or machine drilling.

The iilliJiOVQIllfiiltS reletc particularly to the kind. of drill ortool which provided With detachable and. renevm-hle hits or euttion indetail by aid of the accompanying sheet of drawings, "wherein by Way oisimple 1 illustrate the same epplieii in the construetienoi e chisel hitor tool formed with one transverse Cutting' edge.

litthe ire ignite i represents an eleiuttii-ui oi it oerti of the rrillsteel she-nil: with the iietecluihle cut filXLti therein. .2 is enelcvetion ct 'ht eng les to l i is en elevation the shank or s e with tio cutter rerno v'ilti.

l is a plan if-Fig. O. lii 5 2L side elevs. oi' the cutter iietitel ((l.o

ution oi Fig. lfi 7 is it plain of th techeil cut seen irom the llIMlQTst c. Fig. 8 is i cutter.

in the drawings, 1. reurescnts the drill or steel, end 2 the (let/echo l(the steel i.

is en end l e eiul rcnevmhle hit o; cutter. s, 2L3 shown, proton ablyhiweleil oil on two opposite sides 3 for e port itu oi its length in thedirection of the cletuehehle cutter 2, end it pr YOLUUiOtl oii betweenseitl.

" beveled. let

Specification oi? fillet-tors Patent.

, JOHN HENRY Tiroims,

thei lolony oi the lrensview of the ileleeheii G H A N N ll it (i is,wet Serial Hi). 232.655-

incliceterl et 5 in Figs. '5. anti the end of the steel i is formed 9.slot 6, which slot rounded. cur bottom, as indicated 7 and Ward andupward, we i at at, h s; shoulders or projections '8, formed at the ofthe rounded. portion '5, to the end drill. or steel it. The slot '3 iselse mettle to or wedge shape tre'iist 'sely oi? the steel illustratedmore pertie end 4.

The curl oi? the s hetwe and the rounded e l i o W" the center, is seena i.

The hit 2 in its up} triengu or substantially Whic upon it the cut curig edge 10 su proper eieereiice for: sit penetrates the rich.triangular portion are she 'e. side to iit the beveled parts 5- 0?- thThe portion oi the cutter or hit iittcii in the slot oi the steel '3'.

shape of the slot 6 thet to say, it is fashioned with it bulbous orround egl eni tepereils lower portion 12, corresponding to th upperportion of the transverse slot 6. v

in etteehin the cutter 2 to the steel. 1 the smaller e hulhii'orinprojection 12 is inserted ierger end of the trsnsverse slot 6 and the"butter 2 their projectecl trensely ecri ml of the steel 1 until theectiou i' tly his the slot 6. he i ,2 is iieteeheii by moving: it in the0pdirectionus, for exei'nple, by tapping "t with e heiunici orotherwise.

iet l. cluiin its my invention, and desire l -to protect o3, Letters Peout, is

in it drill for (illlllllg holes iii rock; and the like, in combination,the steel .l. beveled oil on two opposite sides 3, i, and formed with stransverse slot 3, rounded at the bottom '7 end. heveleil inward endupward to the top of the slot and tapered trensvcrsely, the encl of thesteel being beveled upwerill from the sides 5 to the edges of the slot,t 10 cutter .2 shaped on the under side to it the beveled end the steel1 end formed. with it projection 12, corresponding '0 the transverserounded bottom portion '7 oi the steel 6 endwith it bfiitllfil upperpert1?}, which mettle taper or wedge shape, es is clearly illusreteii inFig. 6, to correspond to the semi a oi the 5 being substantially thesame as the diameter Witnesses:

slot 6 formed in the end of the steel 1, said hand in the presence oftwo subscribing Witcutter having its cuttingb edge of a greater nesses.len th than the distance etWeen the sides 3 an 4 of the steel. 1, theWidth of said cutter JOHN HENRY M of the steel at right an les to theslot therein. CHAS. OVENDALE,

In Witness whereof have hereunto set my' B. QVENDALE.

